Hearing aid battery
Hearing aids are generally used by people whose hearing is impaired. In a hearing aid, acoustic input signals are acquired by a microphone, amplified in an amplification device, and the amplified signals are supplied to a speaker. The sound emitted from the speaker is partially fed back to the microphone, resulting in noticeable interference. By using a hearing aid, the user is able to hear sounds which otherwise would not be heard. Hearing aids have a battery compartment for placement of a battery power source for operating the hearing aid. The battery compartment includes a battery door for providing access to the battery compartment to exchange an old battery with a new battery, when the power level of the old battery drops below a useful level. Hearing aids primarily rely on button cells which are symmetrically round. These cells are circular in cross section with diameter and height. The cells are generally button-shaped with diameter greater than height thus referred to as "button cells." Hearing aids generally use zinc-air button batteries because of their inherent high-energy storage and convenience. The zinc-air battery is commercially available in several different sizes. All are pancake looking with the diameter several times the height. Typical zinc-air cells have holes in their casings to admit air. These holes permit oxygen to diffuse into the cell and also permit water vapor to escape.
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